Hello,

According to the "OpenRISC 1200 IP Core Specification", OR 1200 does
not support most of the class II instructions of the OR 1K
architecture. However, I observed that the GNU toolchain generates (at
least some of) these instructions. Is there an option for GCC to limit
it to the OR 1200 instruction set ?

Same for the architectural simulator: it is specified as being a
simulator for the OR 1K architecture. But I would like to make sure
that programs simulated with or1ksim will actually run on the OR 1200
implementation. Is there a way to do this ?

Thanks,
Koen Danckaert

* koen@retarget.com (koen@retarget.com) wrote:

i don't think gcc generates any instructions that are unsupported in
or1200 (provided everything is configured - like hw. multiplication...).
it is true though that binutils can handle complete instruction set. but
that's ok, since you have to explicitly write the 'unsupported' instruction....

best regards,
p.